PDF malware analysis — malicious · 383858b1bf410325

MALICIOUS

PDF

83.6 KB Created: 2021-09-16 06:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: 2ee8b0e0e6cba2a2732c99b938ef9955 SHA-1: 8d1be453113554c3fcbb6728d01248fc1081493a SHA-256: 383858b1bf4103250f6d87a63989667abccd0b92570a17bd65cfeae4a611a1f1

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. Multiple external URLs are present, with one heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://purepassion.pl/userfiles/file/51720867613.pdf In PDF document text
- http://lnianemarzenie.pl/userfiles/file/fovejupumumu.pdfIn PDF document text
- https://www.prshots.com/ckfinder/userfiles/files/578279393.pdfIn PDF document text
- https://luathoanghuy.com/uploads/files/gafimufuweraremawebirofor.pdfIn PDF document text
- https://dcimx.com/files/fonudijenof.pdfIn PDF document text
- http://youngdongtec.com/userfiles/file/nafusadakisinos.pdfIn PDF document text
- http://julianowka.pl/ckfinder/userfiles/files/morevunogurobomisa.pdfIn PDF document text
- https://tanhaithanhvalves.com/quangcao/admin/file/13482697896.pdfIn PDF document text
- http://48bulls.com/js/upload/files/fujarib.pdfIn PDF document text
- http://honeycontacts.com/uploades/userfiles/file/sevebu.pdfIn PDF document text
- http://ohxto.com/uploaded_files/userfiles/files/51651203914.pdfIn PDF document text
- http://mim2010.ru/userfiles/file/35059355139.pdfIn PDF document text
- http://circolonauticofavignana.it/userfiles/files/34287478929.pdfIn PDF document text
- https://lompatjauh.com/contents/files/39614484468.pdfIn PDF document text
- http://all-premium.com/user_file/files/rewuditugisudimulapiv.pdfIn PDF document text
- http://biswasi.com/userfiles/files/40556574702.pdfIn PDF document text
- https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614299236ebd4---62900209865.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5d090974d---logarinoxizoz.pdfIn PDF document text
- http://feach.ie/images/uploads/file/guwoxewidatatuka.pdfIn PDF document text
- https://daynexweb.com/upload/ckfinder/files/vutatewixutaxoloj.pdfIn PDF document text
- http://askaudit.ru/price/lumipobipopevebowadituxip.pdfIn PDF document text
- http://parzenica-bialka.pl/userfiles/files/10167485883.pdfIn PDF document text
- http://logicamail.it/draft/media/xomala.pdfIn PDF document text
- http://stadion-zarya.ru/ckfinder/userfiles/files/72203311187.pdfIn PDF document text
- http://akwarella.pl/user_uploads/file/femenepofugilokuxatit.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=top+io+games+2021PDF link annotation
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e4ab.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4AB	16896 bytes
SHA-256: `86fb20a72f22fb8edca28181695f5aef9f25f4158085c0b3bbb7207c12b4bbad`
`font_01_sfnt_off0001105f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1105F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012876.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12876	10504 bytes
SHA-256: `54c9aca7df89e0adb66104d0bb2db135d35a28c35e748f1497c0711682b2a58a`

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